[ruby-core:118256] [Ruby master Feature#20565] Relax formal argument at label

Issue #20565 has been updated by zverok (Victor Shepelev).


> I knew you can use keywords as names here but am not quite sure about thi=
s. Positional arguments (against my expectations from keyword arguments) do=
n't allow any of these three versions. Should they also work?

The reason why keywords can be used in names is expressiveness on the calle=
r site (not relevant to positional argument), like
```ruby
validate :something, if: :something_else
association :name, class: "Blah"
```

It is inconvenient to fetch such argument values, but it allows to create v=
ery expressive APIs.=20

The alternative would be to have=E2=80=94sometimes discussed=E2=80=94=E2=80=
=9Crenaming=E2=80=9D declarations in signatures, something like
```ruby
def validate(name, condition if: nil)
```
With argument named `if:` by the caller, but available as a local variable =
`condition` in the method body.

----------------------------------------
Feature #20565: Relax formal argument at label
https://bugs.ruby-lang.org/issues/20565#change-108753

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
----------------------------------------
Just a thought: if `def foo(if:)` is possible, shouldn't `def foo(C:)` and =
`def foo($g:)` also be possible...?



--=20
https://bugs.ruby-lang.org/